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1. Brief description: After the Meteo-France model upgrade to the version CNRM-CM6, there is an issue with 2 metre minimum and maximum temperature. Those two surface fields (parameters mn2t6 and mx2t6) are identical. Basically, instead of the correct values of 2m Tmin/Tmax, the mean 2-meter temperature over the past 6 hours is provided. This error affects both the real-time data since the real-time forecasts since the 22nd October 2020 and also the corresponding set of the fixed reforecasts (1993-2017) archived under the model version date 2019-07-01 in MARS archive. 2. Recommendation: As this error cannot be easily fixed in the reforecast data, it was decided not to fix for consistency the real-time forecast fields either. A sort of possible workaround for users needing 2m Tmin/Tmax fields at the daily (24-hourly) time step is to compute the minimum (maximum) over the four 6-hourly values of a given day. The result would be less sharp than it should, thus it is not fully satisfactory and correct solution. |
Occasionally high values of Sea-ice thickness
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1. Brief description: The values of Sea-ice thickness after the model upgrade to the version CNRM-CM6.1 can be occasionally (very rarelly) unusualy higher than usually. Their maxima could reach 160. According to French sea-ice specialists it is not a numerical problem, although such values are very unusual. For example in one of the cases, a dynamical forcing has been found, explaining such massive sea-ice thickening located between 2 islands of the Canadian Arctic archipelago (a rapid increase of meridional surface current has led to sea-ice piling up along the shore of a canadian island). The data from the described case were considered valid and thus allowed to be archived. 2. Recommendation: Users should be aware of this. |
BoM (ammc)
Wrong maximum values of surface air maximum temperature (Tmax) at some points for BoM data
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